We currently are in transition from Exchange 2003 all run on one server to Exchange 2007 running on 2 servers with the front end server having the only role as being the edge server setup in the perimeter network. The mailboxes and public folders are all kept on the other exchange 2007 server as well as doing the remainder of the roles too (ie Hub Transport, Client Access, etc.)
I moved a few mailboxes over to my Exchange07 server without a problem, but most of my mailboxes still live on the Exchange03 server. I am having a flow problem as follows.
Exchange03 to outside OK
Exchange03 to Exchange03 OK
Exchange03 to Exchange07 NDR (unable to relay)
Exchange07 to outside OK
Exchange07 to Exchange07 OK
Exchange07 to Exchange03 OK
The NDR error I receive is: You do not have permission to send to this recipient. For assistance, contact your system administrator.
<mail.****.com #5.7.1 smtp;550 5.7.1 Unable to relay for testing@*****.com>
How do I solve this? Thanks is advance!